Guard for woodworking machines



F. DONLEY.

GUARD FOR WOODWURKING MACHINES.

- 'APPLICATION FILED DEC-16. 1920. 14439390., Patented Oct. 3, 1922 INVENTOR.

ATTORNEY.

W'ILLIAll/JI It. DGICILEY, 0F BIlZIblGI-LQMTQN. NTNV t l. a l r YUBJK.

GUARD FOR VIOODY'R ORKING- MIACHINES.

Application filed December 16, 1920. Serial No. 431,122.

To all whom it may concern:

l lo it known that l, lVrLLrAM Donner, "ten of the United States, residing at inghamton, in the county of Brooms and State of New York, have invented certain new and useful Improvements in Guards for ll oodworking Machines, of which the following is a specification.

This invention relates to safety devices for planers and other woodworking machines in which rapidly rotating cutters, saws, etc. tend to throw the work in an op posite direction to that in which they are intended to be fed.

in machines of the kind referred to, frequently work is thrown from them in consequence of the operation of rapidly rotating tools and. as the work is thrown with great force, injury to worlnnen near the machines is of common occurrence. The object of the present invention is to provide an attachment for machines of the kind reerred to, and for similarly operating machines whereby when work is properly introduced to be operated upon, any movement induced by the tools, tending to throw the worl: from the machine shall instantly and automatically be checked. A further object is to provide in an attachment of this kind. a series of engaging" parts which contact with the work when the latter is introduced into tie machine and which by their form and. engagement shall more effectively prevent throwing of the worl: from the machine than devices of the kin d heretofore proposed for the purpose. Further, the object is to provide means for so mounting and maniputhe on ing parts that they may be ed for use on work of various thicknes es; that they may conveniently be applied to maclnncs of different widths; and

that they may simultaneously be moved into or out of operative positions.

ll ith these objects in view, the invention consists of a safety guard for woodworkin,c and similarly operating machines, having; the novel generic and specific features of coustructimi and arrangement of parts substantially hereinafter described and claimed.

in the present embodiment of the invention it is shown as applied to a planing machine.

in the drawing Fig. is a side view partly in section of a portion of a planing machine with the attachment applied thereto, showing by full lines the parts in positions for use and by dotted lines the positions thereof when out of use.

Fig. 2 is a longitudinal sectional view of the shaft on which the worlcengaging members of the device are mounted, showing the means for mounting the shaft and the means for turning the shaft to bring the parts caried by it into or out of operative positions.

Fig. 3 is a side view of the preferred form of dog or engaging part having a smooth surface intended to contact with the work in a machine to which the attachment is ap plied.

Fig. 4 is a side View of the dog having the contact face thereof toothed or roughened; and,

Fig. 5 is a side view of a modified form of dog.

In the drawing, 1 indicates one side of the frame of a planing machine, 2 represents a feed roller by which work is drawn into the machine to be operated upon, and 3 represents the feed table.

The safety device is located in front of the feed roller and is herein shown as attached to the side frame of the machine. The means of attachment consists of two stub shafts 4. preferably having formed therewith the heads 5 on their outer ends, the heads being provided with openings through which extend bolts or screws 6 by which the heads are secured to the frame 1. Arranged on the stub shafts is a hollow shaft 7 into the ends of which the stub shafts on which the hollow shaft is free to turn, project. The stub shafts are made of uniforn'i length while the hollow shaft is of a length to correspond to the width of the machine to which the device is applied. Therefore, in order to conform to a machine of any width it is necessary only to provide the hollow shaft of the required length.

Arranged on the hollow she ft in positions to be located when in use between the shaft and the feed roller are a number of coni'i-acting members or dogs 8 each having therein an opening 9 for the reception of the shaft. Projecting from the wall of the opening in each dog is a hug 10 which enters a longitudinal channel 11 in the face of the shaft 7, the width of the channel being greater than that of the lug in order that the dog may have a limited rotation independently of the shaft.

' The dogs may be of any suitable form which will insure their contacting with the upper face of work introduced into a ma chine, and, in the event of movement of the work to carry it from the machine, automatically be caused to check such movement by binding the work between them and the work table. The preferred form of dog consists of a disk 8 in which the opening 9 therein for receiving the shaft is eccentrically located. YVhen work is placed in the machine the dogs are brought to contact with the upper face thereof, those portions of the edges of the dogs nearest the pivotal points bearing on the work. Thus any backward movement of the work will be checked by reason of the frictional contact of the dogs with the work and the consequent turning of the dogs to bring those portions of their edges farther removed from their pivotal points into positions firmly to bind the work to the work table.

Instead of depending upon a smooth edge of a dog having suflicient frictional contact with the work to be turned into a binding position on the backward movement of the work, the dogs may have their edges provided with teeth or these edges may be roughened, as shown by the form of dog illustrated in Figure f of the drawing.

In Fig. 5 of the drawing I have shown a modified form of dog. This consists of a body 18 which is oblong in general contour, has an opening 14:, for the reception of the shaft on which it is to be mounted, and has on its outer curved end a series of sharp teeth 15.

The shaft 7 has projectingfrom it an arm or handle 16 by means of which it may be turned 011 the stub shafts to move all the dogs 8 carried by the shaft ends into or out of operative position simultaneously. The limit of rotation of the shaft 7 in either direction is determined by a pin 17 which pro jects through one side of the tubular shaft and enters a groove 18 in one of the stub shafts 41. The length of the groove 18 is such as to allow the shaft 7 to be turned to a position to allow the dogs to rest on the. work on the table and to be moved a distan c forward in the event of a backward movement of the work which is to be checked by the dogs, or to a position to bring the dogs upward and forward of the center of the axis of the shaft 7, in which latter position the dogs will be maintained in imperative position by gravity.

In the operation of the device work is introduced into the machine when the dogs are out of operative position as shown by the dotted lines in 1 of the drawing. The dogs are then turned, by means of the handle 16, to bring their edges or ends to bear upon the work, and as the dogs are all independent of each other and are allowed rotation independently of the shaft on which they are mounted, inequalities in the height of the surface of the work will not prevent contact of each dog with the work beneath it. When the dogs are positioned as set forth, any backward movement of the work by reason of its contact with a rapidly rotating cutter or the like, will result in turn ing the dogs to bring the faces thereof farther removed from the pivoted points to bear upon the work resulting in binding the work to the table and at once checking such backward movement.

I claim:

1. A. device of the kind described comprising a plurality of disks having eccentrically located openings therein and projections extending into the openings, and means for mounting the disks including a hollow shaft extending through the open ings in the disks and provided with a longi tudinal groove of greater width than the projections from the disks, and receiving the latter, and stub shafts having securing means and projecting into the respective ends of the hollow shaft.

2. A. device of the kind described comprising a plurality of disks having eccentrically located openings therein and projections extending into the openings, means for mounting the disks including a hollow shaft extending through the disks and provided with a longitudinal groove of greater width than the projections from the disks, and receiving the latter, stub shafts having securing means and projecting into the respective ends of the hollow shaft, a handle for rotating the hollow shaft extending therefron'i, and. means for limiting the rotation of the shaft.

Means for mounting dogs in a device of the kind (ilescribed comprising stub shafts, provided with means for securing them in position, a hollow shaft having a. longitudinal groove in its face, receiving the stub shafts in its ends, the hollow shaft being provided with projection or handle and with a pin projecting from its inner face, and one of the stub shafts being provided with a groove receiving the pin from the shaft. 7

In testimony whereof I affix my signature.

VVILiLiIi-ilifi F. DONLEY. 

